Gastrointestinal bleeding.
D000368:Aged; D004209:Disposable Equipment / Q000009:adverse effects*; D006471:Gastrointestinal Hemorrhage / Q000150:complications / Q000175:diagnosis*; D006801:Humans; D007082:Ileum; D007441:Intubation, Gastrointestinal; D008297:Male; D014456:Ulcer / Q000150:complications / Q000209:etiology